[Patch 0/8] V3 Implement crashkernel=auto

[Amerigo Wang]

V2 -> V3:
 - Use more clever way to calculate reserved memory size, especially for IA64.
 - Add that patch that implements shrinking reserved memory

V1 -> V2:
 - Use include/asm-generic/kexec.h, suggested by Neil.
 - Rename a local variable, suggested by Fenghua.
 - Fix some style problems found by checkpatch.pl.
 - Unify the Kconfig docs.

This series of patch implements automatically reserved memory for crashkernel,
by introducing a new boot option "crashkernel=auto". This idea is from Neil.

In case of breaking user-space applications, it modifies this boot option after
it decides how much memory should be reserved.

On different arch, the threshold and reserved memory size is different. Please
refer patch 7/8 which contains an update for the documentation.

Patch 8/8 implements shrinking reserved memory at run-time.

Note: This patchset was only tested on x86_64 with differernt memory sizes.

Signed-off-by: WANG Cong <amwang@xxxxxxxxxx>
Cc: Neil Horman <nhorman@xxxxxxxxxx>
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Anton Vorontsov <avorontsov@xxxxxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Bernhard Walle <bernhard.walle@xxxxxx>

---
 Documentation/kdump/kdump.txt    |   28 ++++++++++
 arch/ia64/Kconfig                |   14 +++++
 arch/ia64/include/asm/kexec.h    |   23 ++++++++
 arch/powerpc/Kconfig             |   11 ++++
 arch/powerpc/include/asm/kexec.h |    8 +++
 arch/x86/Kconfig                 |   13 ++++
 arch/x86/include/asm/kexec.h     |    1 
 include/asm-generic/kexec.h      |   42 +++++++++++++++
 include/linux/kexec.h            |    3 +
 kernel/kexec.c                   |  104 +++++++++++++++++++++++++++++++++++++++
 kernel/ksysfs.c                  |   21 +++++++
 11 files changed, 268 insertions(+)
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